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annotate doc/CMU200-notes @ 69:4e263849b064

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fc-cmu200d: CMU200 external attenuation setting implemented in signal gen mode
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Jul 2017 04:52:03 +0000
parents bd62be88259d
children
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bd62be88259d initial import of rfcal code and docs from freecalypso-tools repository
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1 R&S CMU200 is the RF tester used for production RF calibration of FreeCalypso
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2 GSM devices. The CMU200 can be operated in three ways: manually via the front
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3 panel, programmatically via GPIB and programmatically via SCPI commands over
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4 RS-232. GPIB is the industry standard, but for FreeCalypso the Mother has
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5 adopted the RS-232 control interface method instead in order to avoid the
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6 exotic hardware and equally exotic drivers and libraries required for GPIB:
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7 using the RS-232 interface requires absolutely no special hardware or drivers
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8 or libraries, just userspace C code without any dependencies talking to a
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9 serial port just like we do when communicating with Calypso target serial ports.
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10
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11 Initialization commands
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12 =======================
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13
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14 Our Test System Interface Daemon for the CMU200 will issue the following SCPI
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15 commands to the instrument on start-up:
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16
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17 *SEC 0
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18 *RST;*OPC?
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19 SYST:NONV:DIS
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20 SYST:REM:ADDR:SEC 1,"RF_NSig"
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21 SYST:REM:ADDR:SEC 2,"GSM900MS_NSig"
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22 SYST:REM:ADDR:SEC 3,"GSM1800MS_NSig"
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23 SYST:REM:ADDR:SEC 4,"GSM1900MS_NSig"
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24 SYST:REM:ADDR:SEC 5,"GSM850MS_NSig"
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25
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26 VCXO calibration
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27 ================
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28
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29 When commanded to prepare for VCXO calibration, our TSID will command the
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30 CMU200 as follows:
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31
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32 *SEC 2
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33 RFAN:CHAN 40CH
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34 RFAN:TSEQ GSM5
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35
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36 Command to read frequency offset:
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37
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38 READ:MOD?
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39
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40 Signal generator mode
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41 =====================
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42
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43 Turn signal generator on:
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44
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45 *SEC 1
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46 SOUR:RFG:LEV <level_in_dbm>
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47 SOUR:RFG:FREQ <freq_in_hz>
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48 INIT:RFG
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49
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50 Turn signal generator off:
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51
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52 ABORT:RFG